Engine/Transmission (1994 - 1998) 97 egr removed...

[SMoules]

... and check engine light is on. now ive searched this topic already and somewhere it was said that you can cross over wires to rid of the light. is this a simple solution to rid of the light?

 

[jtwcummins]

When the EGR is on the ECM is looking for a 10* rise in intake air temp. I used a relay and used the EGR solenoid voltage to pick it up. Using a scanner I tried different resistance using pots to adj. Found about 8k set temp to around 75* and 6k about 65*. Disconnected the IAT and ran wires to resistors to the IAT pig tail. Used a Radio shack relay and by playing with the values I got rid of the check engine lite. Used NC connection for cooler temp and the contacts hot when picked up to get the 10* IAT temp rise.



The best way is to get A Federal, non egr ECM and swap yours out. I did this to get rid of the trans gov pressure code after getting DTT trans. Contrary to what has been said, you do not need to get the ECM reflashed. I did the swap and have had no issues or those Calif EGR or other codes.

 

[guldam]

Bump back up...



Does an ECM store mileage or anything else that is related to an individual truck?



GulDam

When the EGR is on the ECM is looking for a 10* rise in intake air temp. I used a relay and used the EGR solenoid voltage to pick it up. Using a scanner I tried different resistance using pots to adj. Found about 8k set temp to around 75* and 6k about 65*. Disconnected the IAT and ran wires to resistors to the IAT pig tail. Used a Radio shack relay and by playing with the values I got rid of the check engine lite. Used NC connection for cooler temp and the contacts hot when picked up to get the 10* IAT temp rise.



The best way is to get A Federal, non egr ECM and swap yours out. I did this to get rid of the trans gov pressure code after getting DTT trans. Contrary to what has been said, you do not need to get the ECM reflashed. I did the swap and have had no issues or those Calif EGR or other codes.

 

[Gary - K7GLD]

Bump back up...



Does an ECM store mileage or anything else that is related to an individual truck?



GulDam

Short answer No.





(That's the long answer too!)

 

[JacobsonD]

Where does one get A Federal, non egr ECM?

I'm trying to solve my CA smog issues. The previous owner removed the EGR system and disabled the MIL "check engine light. " Now, my engine fails the CA smog check.

 

[guldam]

I am looking for non california ecm for my 97.



These guys say they have them:



eBay Store - AUTO COMPUTER EXCHANGE: Rebuilt ECM ECU TCM Computers, Warranty All Makes Models Years



GulDam

Where does one get A Federal, non egr ECM?



I'm trying to solve my CA smog issues. The previous owner removed the EGR system and disabled the MIL "check engine light. " Now, my engine fails the CA smog check.

 

[jtwcummins]

Swap of ECM doesn't change odometer reading. Got my Fed ECM through the TDR ads.

The Fed ECM might cause a failure using a scanner since it doesn't show the egr. Not sure but I used the relay and resistors for 3 yrs w/o a check engine.